import java.util.*;
public class Example3_9{
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        double sum = 0;
        int m = 0;
        while (reader.hasNextDouble()){
            double x = reader.nextDouble();
            m++;
            sum = sum+x;
        }
        System.out.printf("%d个数的和为%f\n",m,sum);
        System.out.printf("%d个数的平均值是%f\n",m,sum/m);
    }
}